<p dir="ltr">This poster explores the role of video games in shaping sociotechnical imaginaries for sustainable futures in an era of global polycrisis. It highlights how mainstream game narratives often default to dystopian or techno-optimistic visions, leaving biocentric and participatory futures largely absent.</p><p dir="ltr">The research applies <b>Participatory Research through Design</b> to co-create a <b>Desirable Futures Toolkit</b> that enables game designers and art directors to integrate sustainability and environmental justice into worldbuilding. The poster outlines the methodology (industry survey, participatory design sessions, and a game jam) and presents preliminary findings showing the dominance of collapse and techno-fix narratives over values-shift scenarios.</p><p dir="ltr">By centering diverse voices and nature-based approaches, this work aims to expand collective efficacy and redirect cultural imaginaries toward equitable, regenerative futures.</p>